Document Type and Number:
Japanese Patent JPS5419871
Kind Code:
Y1
Application Number:
JP9788974U
Publication Date:
July 20, 1979
Filing Date:
August 15, 1974
Export Citation:
International Classes:
G03B27/73; G03B27/74; (IPC1-7): G03B27/74
Domestic Patent References:
| JPS4212547Y1 | ||||
| JPS4222340Y1 | 1967-12-20 | |||
| JP40018182A |